MLX80004 Datasheet, PDF (21/38 Pages) Melexis Microelectronic Systems – Enhanced Universal Dual/Quad LIN Transceiver

MLX80002/MLX80004
Enhanced Universal Dual/Quad LIN Transceiver
Datasheet
8.7. Master / Slave configuration
The target applications of the MLX80004/2 are BCM master modules with multiple LIN channels. In order to be able to
use the same module for a wide variety of applications with different stages of extension, a space efficient and cost
effective adaptation on the number of LIN channels is desired.
The MLX80004/2 device family offers the combination of quad and dual channel LIN transceiver within the same
advanced package and a compatible foot print.
By the integration of the LIN master-termination (decoupling diode and 1K resistor) the external circuitry can be
minimized in terms of space as well as BOM (bill of material). The RxD time-out feature allows the handling of a LIN
short to ground failure without software support by the microcontroller. This application mode is called enhanced
master mode, compatible to the functionality of the quad – LIN transceiver MLX80001.
In case of different BCM requirements it may happen that the external master termination is desired only. To cover
these applications the pin DIS_MAS has been introduced:
DIS_MAS
GND
Vs
Mode
Enhanced Master
Mode
Standard
Transceiver Mode
LIN termination
Active mode : Diode & 1k
sleep mode :Diode & 60µA
Active mode : Diode & 30k
sleep mode :Diode & 60µA
Supported fail safe features
 RxDx time-out, independent disconnect of master
termination in case of LINx short to ground
 TxDx time-out, independent disable of faulty
dominant blocked transmit path
 TxDx time-out, independent disable of faulty
dominant blocked transmit path
Table 9: Time Out Modes
In case of externally mounted master termination (standard transceiver mode), the handling of a LIN short to ground is
not possible. By using the standard transceiver mode, the MLX80004/2 can be used in slave applications as well. To
pull the pin DIS_MAS to high even in case the external ECU regulator is switched off in sleep mode. The pin shall be
connected to Vs via an external resistor. (see Figure 8 at page 24, application example)
In the standard transceiver mode, only the TxDx time-out feature is enabled.
Revision 021 – Sept 2016
Page 21 of 38